Cam operated kniee construction



Jan. 19, 1932. R. B. LONG v 1,841,967

CAM OPERATED KNIFE CONSTRUCTION Filed NOV. 28. 1927 INVENTOR. ROBERT 8.LONG.

1i TTORNEX Patented Jan. '19, 1932 UNITED STATES PATENT I OFFICE ROBERTJ3. LONG, or DAYTON, 01110, ASSIGNOR To OHMER REGISTER coMreNY,

. or DAYTON, onro CAM OPE ATED KNIFE coNsTRUcTroN' This invention is amodification of the structure shown in the application of John F. Ohmerand Robert B. Long, Serial No. 220,765, filed September 20,1927, andcon- {jstitutes an improvement thereon in that a single cam is employedto raise and lower the movable knife plate. The single cam may, in fact,be in duplicate but each of the cams would perform exactly the samefunction.

.10 Referenceis made to the said copending application for a moredetailed discussion of the advantages and merits of a knife of theconstruction shown herein.

The attached drawings show the preferred embodiment of myimprovedconstruction in which- Fig. 1 is a front elevational view of aportion of a machine having incorporatedtherein my knife construction.

Fig. 2 is an elevational view of the left hand side of the machine shownin Fig. 1.

Fig. 3 is a cross-sectional view on the lin 33 of Fig. 1.

Figs. 4:, 5 and 6 are detail cross-sectional views on the line 4.4.- ofFig. 1.

Fig. 4 shows the parts in normal position.

Fig. 5 shows the same parts after the cam has made a portion of arevolution and has completely lowered the movable knife, and

Fig. 6 shows the same parts after the cam has practically completed itsrevolution, and has severed the paper. Y

The operating handle 1 is secured to a shaft 2 which carries a gear 3which meshes with a gear 4 attached to a disk 5 provided with teeth 6for a portion of its circumference forming a segmental gear. The disk 5is attached to a disk 7 which has a radius equal to the pitch radius ofthe teeth 6. The gear 1, disk 5 and disk 7 are rotatably mounted'on theshaft 8 but are operatively connected with a disk 9 and ratchet 10 whichform a fullstroke mechanism. If the full-stroke mechanism is notdesired, the gear 4: may be directly secured to the shaft 8.

The ratchet 10 is provided with a stud pin 11 which operates a pitman 12which actuates an oscillating printing carrier 13 which carries platens14, one of which is shown in Fig. 3, which press a strip of paper 15against type wheels 16. The disk 5, segmental gear 6 and disk 7cooperate with a Geneva pinion 17 attached to a shaft 18, which piniondrives a pinion 19 on a shaft 20. .The shafts 18 and 20 are providedwith feed rollers 21. and 22 respectively between which the paper strip15 is fed after being printed, from whence it passes through the knifemechanism, hereinafter to be described, where the printed ticket orreceipt is sheared from the paper strip 15 and delivered to the customeror passenger.

A locking plate 23 is bifurcated at its upper end and receives the shaft18 in the bifurcation. It is provided with a slot 24: which receives across-bar 25 mounted on standards 26 secured to a cross-bar 27 Thestandards 26 are furthermore provided with cutaway portions (not shown)which receive the rotatable shaft 8 thereby holding the standardsagainst turning. The lower end of the lockingplate 23 is provided with arearwardly and downwardly extending arm 29 which engages the shaft 8 andserves as a stop for the locking plate 23. The locking plate 23 is alsoprovided with a downwardly and forwardly extending arm 30. Arms 31 arerotatably mounted on the cross-bar 27,

which arms carry a rod 32. The arms 31 are provided with outwardlyextending lugs 33 which may be engaged by levers 34: mounted onthe'cross-bar 27. Arms 35 also connect the cross-bar 27 and the rod 32.

The stationary knife 36 has secured thereto plates 37 and 38 havingrearwardly extending guides 39 for the paper. It is also provided withan aperture 40 through which the paper is fed. The upper end of thelocking plate 23 is provided with a forwardlv and downwardly extendinglug 4.1

which moves the stationary knife 36 immereceives the cross-bar 27. Theplate 37 is made of resilient metal so as to resiliently clamp thecross-bar 27 between the lower end of the stationary knife and the plate37. The knife construction is then pressed rearward ly so that the log41" of the locking plate 23 engages the'station'ary knife 36, slightlybelow the aperture 40. The rod 32 is moved rearwar dl so. as to engagethe forward arm of the ocking plate 23, c'lampingth'e'lug 41 to thestationary knife. The levers 34 then move downwardly, locking thearms-31 and 35 against movement. The knife mechanism may be readilyremoved'by reversing the above mentioned operation.

Substantially U-shapedsprings 42 are secured to the stationary knife 36by any convenient *ineans; which springs extend forwardPy'of the knifeand press the movable knife 44 toward the stationary-knife 36. Therea'mtwo such springs 42 near-the opposits endsef the movable knife. I Themovable knife 44 is provided with a channel 45 which efitends throughoutthe length .thereof and-'froma'point shortly beneath the top orcutting-edge thereof to near'the bottom. The stationary knife-36 isprovided with an upwardly extending "guide 46 and a horizontal guide 47,which guides 46- and 47 form the guiding-plate 'of the movable knife,but there'is'- no similar guide'on the left hand side of the knife. FromFig. 1' it will be noticed that the upper or cutting edge of themovable'knifeis notparallel to the lower edge of theguide 47 which formsthe cutting edge-(9f the"stationaryf knife. Furthermore,

since thesprings-42 press the movable knife toward the" stationary knifeandsince the gide lfi supports one end of the movable i'fe but there isnothing-'to support the other eridthereof, the plane of the movableknife does not'coincidewith the plane of thestationary knife when'theshearing action is commenced, but as the shearing action pro "esses"themovable knife is raised,

traveling along' the guide 46 and: each successive point of the cuttingedge of the'movable knife" engagesthe cutting edge of the guide 47 ofthe stationary knife, sothait when the action of shearing iscompletedthe two knife edges lie in the same-plane. When the knife is inits lower position'as shown in Figs-'4 and 5, the knife edges are not inthe sam'e'gane; As a matter of fact,-they form somet 'ng of a V' withthe point of the V on the ""This is caused by the guide 46 holding outthe ri lit-hand edge (Fig. l) of the movable kni e while the left-handspring'42 presses the ieft-hand end thereof inwardly. Howeveryas theknife is raised intothe' position shown in Fig.6 the righthand eiid'ofthe movable knife remains supported fe ithe'r by the guides 46 or 47while the left-hand 'end'thereofis gradually raised by the guide" 47againstthe tension of the left-hand spring 42 so that at the end of thecutting stroke the left-hand edge of the movable knife has been movedoutwardly just as far as the right-hand edge thereof. In this positionboth the right-hand end and the lefthandend of the movable knife rest onthe guide 47- and the two edges which are pressed together lie in thesame plane. This action brings each and every point of the movable"knifee'dge into contact with the corresponding point of the stationaryknife edge so that almost the entire force of the springs 42 issuccessively exertcd'on the succeeding portions of the paper so that theknife edges will sever the same even though the knife edges mightnot beperfectly straight or might be warped'slightly. Furthermore, as theknife travels upwardly, as soon as the cutting edge of the movable knifehas moved over the horizontal guide 47 of the stationary knife thechannel 45 receives that portion of the horizontalvguide 47 to the rightof the cutting edge as viewed in Fig. 1 so that it will prevent anytendency of that part of the movable knife which has completed thesevering operation from holding that part which has not completed thesame away from the stationary knife. This construction also insures thateach of the knife edges will sharpen the other knife edge.

The lower portion of the movable knife 44 is provided with a V-shapedhook48 which receivesaknob 49 of a bell crank lever 50 pivoted on a pin51 secured to a plate 52 mounted on the shaft 8 and crossbar 27. Theother end of the bell crank lever 50 is provided with an offset lug 53which projects into the path of movement of the cam 54 rigidly securedto the shaft& A bell crank lever 55 is pivoted on the cross-bar 27. Onearm of the bell crank lever 55 is provided with a cam surface 56 whichis engaged by the said cam 54. The other arm of the bell crank lever 55is provided with a cam 57 which engages the lower beveled edge 58 of thelug 53. Beyond the cam 57 is a recess 59 to receive the lug 53 and thesecond arm of the bell crank lever 55 terminates in a cam portion 60.

The parts are normally in the position shown in Fig. 4, at which timethe crank handle 1 is directly below the shaft 2. As the crank handle 1starts its operation the shaft 8 is rotated with it. The cam 54 is inengagement with the cam surface 56. As the cam 54 rotates in acounter-clockwise direction as viewed in Fig. 4 it rotates the bellcrank 'lever55 in a clockwise direction so that the cam 57 engages thelower beveled surface 58 of the lug 53, rotating the bell crank lever 50clockwise and lowering the movable knife 44 from the position shown inFig. 4 to that this rotation it engages the cam portion 60 of the bellcrank lever 55, rotating the lever 55 in a counter-clockwise directionand thereby lowering the forward edge of the recess 59 below the lug 53or into the position shown in Fig. 6. The cam 54 now engages the lug 53of the bell crank lever rotating the bell crank lever50 inacounter-clockwise direction and raising the knife into the positionshown in F 6 and severing the paper. When the cam 5% has passed the lug53 it engages for a second time the cam surface 56, rotating the bellcrank lever 55 in a clockwise direction so that the cam 57 again engagesthe beveled surface 58 of the lug 53 thereby slightly rotating the bellcrank lever 50 in a clockwise direction and lowering the knife 44- fromthe position shown in Fig. 6 to that shown in F l and thereby completingthe operation. It is necessary to lower the knife as last described sothat in case the paper 15 has been completely consumed a new roll couldbe inserted in the machine and one end thereof passed through theopening 40. If the knife closed this opening it would be impossible toinsert the end of a new roll of paper.

It is, therefore, obvious that the cam 54 performs the function of firstlowering the knife, then raising it and slightly lowering it. In thesaid application of John F. Ohmer and Robert B. Long, Serial No.220,765,a cam raised the knife and springs were employed to lower thesame, whereas in this application a cam performs the function of bothraising and lowering the knife. The cam, therefore, serves as a means topositively raise and lower the knife blade whereas in the saidapplication there were no positive means to lower the lmi fe. I used theword positively in contradistinction to a spring means to accomplishthis function.

Having now described my invention, I claim:

1. In combination, a knife, a cam, means whereby said cam is rotated, aplurality of interconnected levers operated thereby and both lying inthe path of movement of said cam and means whereby said knife isoperated by said levers so that it is initially actuated in onedirection and is then positively actuated in the opposite direction.

2. In a knife construction, a knife, a cam, a lever connected to saidknife, a second lever actuated by said cam and operating said firstlever to move said knife, said cam subsequently engaging said firstlever and actuating said knife in the opposite direction.

3. In a knife construction, a knife, a cam, a lever, a lug carried bysaid lever, a second lever actuated by said cam and thereby moving saidlug to operate said first lever to move said knife, said camsubsequently engaging said lug and actuating said knife in the oppositedirection.

4:. In a knife construction, a knife, a cam, means whereby said cam isrotated, a lever interposed between said cam and knife, a lug on saidlever, a second lever rotatable by said cam on its initial rotation torock said second lever into contact with said lug and thereby rock saidfirst lever to actuate said knife, and means to positively actuate saidknife in the opposite direction to that of its first movement.

5. In a knife construction, a cam, a lever rocked in one direction bysaid cam, a second lever rocked by said cam and actuating said firstmentioned lever in the opposite di rection to that induced by the cam onsaid first lever, a knife, a hook secured to said knife and operativelyconnected to said first mentioned lever.

6. In combination, a rotatable cam, a reciprocable knife, a leverdirectly engagable with said cam during a portion of its rotation toactuate said knife on its cutting stroke, a second lever provided with asurface with which said cam will contact to rock said second lever, andmeans interconnecting said levers to rock said first mentioned lever onthe first part of the rotation of said cam to retract said movableknife.

7. In combination, a cam, means whereby said cam is rotated a pluralityof interconnected levers lying in the path of movement of said cam, areciprocable knife operatively connected to one of said levers, said camacting on said levers to first lower said knife, then raise it and thenlower it to initial position.

In testimony whereof I afiix my signature.

ROBERT B. LONG.

